hphp/util/file.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #pragma once
  18
  19 #include <folly/Range.h>
  20
  21 #include <ctype.h>
  22
  23 namespace HPHP::FileUtil {
  24 ////////////////////////////////////////////////////////////////////////////////
  25
  26 /*
  27  * Check if the given character is a directory separator for the current
  28  * platform.
  29  */
  30 inline bool isDirSeparator(char c) {
  31 #ifdef _MSC_VER
  32   return c == '/' || c == '\\';
  33 #else
  34   return c == '/';
  35 #endif
  36 }
  37
  38 /*
  39  * Get the preferred directory separator for the current platform.
  40  */
  41 inline char getDirSeparator() {
  42 #ifdef _MSC_VER
  43   return '\\';
  44 #else
  45   return '/';
  46 #endif
  47 }
  48
  49 /*
  50  * Check if the given path is an absolute path.  This does not guarantee that
  51  * the path is canonicalized.
  52  */
  53 inline bool isAbsolutePath(folly::StringPiece path) {
  54 #ifdef _MSC_VER
  55   auto const len = path.size();
  56   if (len < 2) {
  57     return false;
  58   }
  59   // NOTE: Boost actually checks if the last character of the first path element
  60   // is a colon, rather than if the first character is an alpha followed by a
  61   // colon.  This is fine for now, as I don't know of any other forms of paths
  62   // that would allow.
  63   return (isDirSeparator(path[0]) && isDirSeparator(path[1])) ||
  64     (isalpha(path[0]) && path[1] == ':');
  65 #else
  66   return path.size() > 0 && path[0] == '/';
  67 #endif
  68 }
  69
  70 ////////////////////////////////////////////////////////////////////////////////
  71 }
  72